I only use Frigate. All of the Amcrest stuff is turned off.

Each of the cameras have two video streams. The "live" stream is set to 1080p, and the "sub" stream is set to 720p. The sub stream is what Frigate uses for detection. Here is a sample of what a camera config would look like in the frigate.yml file:

cameras:
  back:
    ffmpeg:
      inputs:
        - path: rtsp://camera-username:camera-password@camera-ip-address:554/cam/realmonitor?channel=1&subtype=2
          roles:
            - detect
            - record
    detect:
      width: 1280
      height: 720

My HA runs in a Proxmox VM with 4 vCPUs, 4GB of RAM and 128GB storage. The VM also has access to a network drive, which is where nightly backups are stored.

By default, the HAOS Frigate addon will store recordings on the host machine (you can define any volume if you're running Frigate in docker), and you can set "event" retention in the frigate config file - default is 10 days. You can download any clip or snapshot directly from the Frigate UI to whatever device you are using. OR, if your setup is similar to mine, you can pull from backup.

My nightly backup to my network drive includes the frigate folder with the recordings and snapshots, which is also set to retain 10 days/backups, and finally there is a weekly Borgbase backup of that network folder to a server on another continent, so I don't feel like I need any kind of dedicated storage hardware - normal backup procedures work just fine!

With this setup, CPU usage never goes above around 35% (keep in mind that I have a Coral TPU, which takes all the detection load off of the CPU) and with the configured Frigate retention policy, storage usage for the entire VM never exceeds 50% of the total available space.

This setup has been running flawlessly for almost 3 years now. Detection is immediate, as are the push notifications. Very happy with it!